Stuck in ShowWindow - C / C++ / MFC Discussion Boards

Rick York31-Dec-08 11:47

31-Dec-08 11:47

First, I would recommend defining a type for your map. Something like :

typedef map<string,int> StringIntMap;

This could simplify some of the code.

Second, try using some temporary variables of the correct type to save the values of the first and second members of the iterator and then use those temps for the output. That should show you exactly what the compiler is expecting for variable types and allow you to cast if and as needed.

Re: conversion problem

wubousc31-Dec-08 13:32

wubousc

31-Dec-08 13:32

Hi, Rick,

Do you mean I should change the code like this?

ostream & operator << (ostream &out, map<string,> &siMap)
{
  for(map<string,>::iterator it = siMap.begin(); it != siMap.end(); ++it)
  {
string key = it->first;
int value = it->second;
out<<"key: "<<key<<" value: "<<value<<endl;
  }

  return out;
}

However, it doesn't fix the problem. I am confused because I think ostream has the ability to output string no matter it is const or not.

regards,
Bob

How to separate a specified number of Bits from a DWORD?

Joseph Marzbani31-Dec-08 8:16

Joseph Marzbani

31-Dec-08 8:16

Suppose we have a number of type DWORD and we want to extract four 6-bit number and a byte from it. Some thing like this:

(DWORD) ---> 10100101101000110100011010101001

(Result) ---> 101001 011010 001101 000110 10101001

If you want to introduce me 'Bit Field Operators', be aware! It does NOT work in this manner.

Thank you masters!

Re: How to separate a specified number of Bits from a DWORD?

harold aptroot31-Dec-08 8:25

harold aptroot

31-Dec-08 8:25

Just shift and mask it?
the byte: dword & 0xFF
last 6bit value: (dword >> 8) & 0x3F
next 6bit value: (dword >> 14) & 0x3F
etc?

Would that work?

Re: How to separate a specified number of Bits from a DWORD?

Jijo.Raj31-Dec-08 11:54

Jijo.Raj

31-Dec-08 11:54

Possibly another approach is to use union. Just check the following code snippet.

// Disable the packing.
#pragma pack(1)

// Use the union to access bytes of DWORD.
union DWordParser
{
    DWORD DwordValue;
    BYTE Bytes[4];
};

// Using the parser.
DWordParser Parser;
Parser.DwordValue = 255;

// Now get 6 bits of 3ed byte.
BYTE ThirdByte = Parser.Bytes[2] & 0x3F;

But you have to sacrifice performance for readability. Wink | ;)

Regards,
Jijo.

_____________________________________________________

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Re: How to separate a specified number of Bits from a DWORD?

krmed31-Dec-08 14:12

krmed

31-Dec-08 14:12

Can you explain why you feel that bit fields won't work for you?

Karl - WK5M
PP-ASEL-IA (N43CS)
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Re: How to separate a specified number of Bits from a DWORD?

Richard Andrew x641-Jan-09 6:52

Richard Andrew x64

1-Jan-09 6:52

krmed wrote:
Can you explain why you feel that bit fields won't work for you?

I'm guessing it's because he didn't know how to use them properly. Poke tongue | ;-P

Stuck in ShowWindow

dj440031-Dec-08 4:41

dj4400

31-Dec-08 4:41

Hi all,
I have a multithreaded application written in c++ vs6.
I try to create a new dialog within an existing dialog in that application and when i call
ShowWindow(SW_SHOW)for the new dialog it doesnt do anything.
If i put a break point there, it seems that it stops in the call to ShowWindow and doesnt continue the execution.
Can someone explain this strange behavior and suggest a way to overcome this problem?
Thanks
Simon.

Re: Stuck in ShowWindow

Mark Salsbery31-Dec-08 6:13

Mark Salsbery

31-Dec-08 6:13

All these dialogs are created on the same thread?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Stuck in ShowWindow

led mike31-Dec-08 7:20

led mike

31-Dec-08 7:20

Mark Salsbery wrote:
All these dialogs are created on the same thread?

ddd_shocron wrote:
I try to create a new dialog within an existing dialog

Doesn't that tell you exactly what is being done? It's created within Laugh | :laugh:

led mike

Re: Stuck in ShowWindow

Mark Salsbery31-Dec-08 7:24

Mark Salsbery

31-Dec-08 7:24

led mike wrote:
Doesn't that tell you exactly what is being done?

I know it should, but I'm not so bright...

Poke tongue | ;-P

(early) Happy New Year! Beer | [beer]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Stuck in ShowWindow [modified]

dj440031-Dec-08 20:48

dj4400

31-Dec-08 20:48

yes all these dialogs are created in the same thread.

To be more precise i call the create function for that dialog in the ctor of the containing dialog
and i call the ShowWindow(SW_SHOW) from within the OnInitDialog ,just before
i return true for the OnInitDialog.

Sigh | :sigh:

dj4400 formerly known as ddd_shocron

modified on Thursday, January 1, 2009 3:14 AM

Re: Stuck in ShowWindow

Mark Salsbery1-Jan-09 6:27

Mark Salsbery

1-Jan-09 6:27

dj4400 wrote:
i call the create function for that dialog in the ctor of the containing dialog

If the containing dialog is used as the parent for the created dialog,
then that may not work - the parent dialog window (HWND) hasn't been created yet
at that point.

Try calling create for the child dialog in the parent's OnInitDialog() (after calling
the base class' OnInitDialog()).

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Stuck in ShowWindow

dj44003-Jan-09 23:06

dj4400

3-Jan-09 23:06

Thanks Mark, you are right - i called the create function in the OnInitDialog and then it worked properly.
Smile | :)

how to solve the following problem?

zhiyuan1631-Dec-08 4:12

zhiyuan16

31-Dec-08 4:12

dear all

any problem? i couldn't find. thanks a lot

void CMeiTengDlg::OnPause() 
{
	// TODO: Add your control notification handler code here
	if(Pause)
	{
		m_Pause.SetWindowText("Pause");
		MCIWndResume(m_Video);
		Pause = FALSE;
	}
	else
	{
		m_Pause.SetWindowText("UnPause");
		MCIWndPause(m_Video);
		Pause = TRUE;
	}
}

void CMeiTengDlg::OnBrowse() 
{
	// TODO: Add your control notification handler code here
	m_Video = NULL;
	if(m_Video == NULL)
	{
		CFileDialog avi(TRUE,NULL,NULL,OFN_HIDEREADONLY,"MP3 Files (*.mp3)|*.mp3|AVI Files(*.avi)|*.avi|");
		if(avi.DoModal() == IDOK)
		{
			m_Path = avi.GetPathName();
			UpdateData(FALSE);
			
		}
	}
	
}

the resilt of compiling:

MeiTengDLg.cpp
.\MeiTengDLg.cpp(235) : error C2664: 'CWnd::SetWindowTextW' : cannot convert parameter 1 from 'const char [6]' to 'LPCTSTR'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
.\MeiTengDLg.cpp(241) : error C2664: 'CWnd::SetWindowTextW' : cannot convert parameter 1 from 'const char [8]' to 'LPCTSTR'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
.\MeiTengDLg.cpp(277) : error C2664: 'CFileDialog::CFileDialog(BOOL,LPCTSTR,LPCTSTR,DWORD,LPCTSTR,CWnd *,DWORD,BOOL)' : cannot convert parameter 5 from 'const char [48]' to 'LPCTSTR'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Build log was saved at "file://c:\Documents and Settings\ZhiYuan Li\Desktop\MeiTeng\MeiTeng\Release\BuildLog.htm"
MeiTeng - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Re: how to solve the following problem?

Jijo.Raj31-Dec-08 4:27

Jijo.Raj

31-Dec-08 4:27

I think you've enabled unicode in your project settings. Enclose all your strings inside _T() macro like as follows, so that they will switch accordingly to either ansi or unicode strings.

m_Pause.SetWindowText( _T("Pause") );

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Removing Command bar controls of Excel-2007 in c++

SRKSHOME31-Dec-08 1:39

SRKSHOME

31-Dec-08 1:39

Hi,
How to delete command bar controls of excel in c++?
I know when we automate excel, there is a functin GetCommandBars().
I dont know how to use this? Anyone has idea?

Re: Removing Command bar controls of Excel-2007 in c++

led mike31-Dec-08 4:49

led mike

31-Dec-08 4:49

Maybe this documentation [^]will help you

led mike

Pixel

Krishnakumartg31-Dec-08 1:02

Krishnakumartg

31-Dec-08 1:02

Hi all,

I have a doubt regarding window graphics painting.
As we already know we can draw a rectangle in window.
Ok...
Suppose I am drawing a rectangle with values ( 0, 0, 100, 100 ).

Now my question is,
can I draw a rectangle with values (0.5, 0.75, 100.1, 100.4) or something like that.

Why I am asking because, according to my understanding pixel is the smallest possible drawing resolution.

If it is possible, could you please help to implement that?

Regards,
Krishnakumar

Re: Pixel

CPallini31-Dec-08 2:45

CPallini

31-Dec-08 2:45

GDI primitives accept only integers. You may use GDI+ (see for instance [^]).

Krishnakumartg wrote:
Why I am asking because, according to my understanding pixel is the smallest possible drawing resolution.

The above is obviously true. GDI+ just gives a level of abstraction.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Pixel

Krishnakumartg31-Dec-08 4:23

Krishnakumartg

31-Dec-08 4:23

Tried the following code.

CDC* pDC = m_Window.GetDC();
Graphics graphic( pDC->GetSafeHdc());

CRect wRect;
m_Window.GetClientRect( &wRect );
wRect.DeflateRect( 0, 0, 1, 1 );
RectF rect( wRect.left, wRect.top, wRect.Width(), wRect.Height());
Color color;
color.SetFromCOLORREF( RGB( 100, 0, 0 ));
Pen pen( color );
graphic.DrawRectangle( &pen, rect );

rect.Inflate( -0.5, -0.5 );
Color color2;
color2.SetFromCOLORREF( RGB( 0, 100, 0 ));
Pen pen2( color2 );
graphic.DrawRectangle( &pen2, rect );

But the graphic.DrawRectangle( &pen2, rect ); draws the rectangle in the next pixel.
Is there anything additional to do to work the floating points?

regards,
Krishnakumar

Re: Pixel

CPallini31-Dec-08 5:22

CPallini

31-Dec-08 5:22

Do you want to break the pixel?
Confused | :confused: